What is a base layer | Do I need a base layer | TOG24 (2024)

When you’re out and about exploring in winter, base layers are super essential. They form one part of the three-layer system that’s designed to keep you dry and warm. The base layer acts to remove moisture from your body, whilst a mid-layer keeps you warm and an outer layer protects you from the elements.

So, if you’re considering investing in some new base layers, this is what you need to know.

What is a base layer?

A base layer is the layer that sits closest to your skin. It should act as a second skin throughout the day when you’re out exercising or adventuring. It works by providing a layer of warmth while absorbing and evaporating your sweat – this helps to keep you feeling warm and comfortable. When you’re shopping for base layers, you should look for those that are quick wicking, i.e. that they wick away your sweat rather than absorb it.

Do I need a base layer?

It depends on the exercise you’re doing. If you’re going out for a run in the depths of winter, walking for long hours in cold conditions or heading to the top of the slopes with your skis or snowboard, then base layers are essential. If you’re exercising in cold conditions and you don’t have a base layer your sweat can be absorbed by your clothes, which will cool and in turn cool your body temperature. When working up a sweat in cold conditions, a base layer is key.

Base layers should be worn alongside a mid-layer and an outer-layer, with the three working together to keep you both warm and dry in cold and wet conditions.

Is a base layer the same as a thermal?

Kind of. The best way to view thermals is as a type of base layer. Thermals focus more on keeping you warm, rather than wicking away sweat. If you know you’re going to be in the outdoors in the cold but won’t be working up a sweat, then thermals would likely be the best choice. Base layers will also keep you warm, but they’re also made from specialised materials that work to wick away sweat too. So if you’re out in cold temperatures hiking, skiing or running, base layers will keep you more comfortable in these physically intense scenarios as they’ll get rid of the sweat from your skin which can leave you feeling cold.

What is the warmest base layer for skiing?

Heading on a skiing adventure sometime soon? Base layers will be an essential part of your skiing kit. But which materials work best for time on the slopes?

Cotton is a no-go. By choosing cotton, you’ll opt for something that may keep you warm in theory, but the material won’t wick away sweat. This means it will absorb and hold onto the moisture, and once the wet cotton cools it will cool your body temperature too which can be dangerous.

For skiing you should opt for base layers made from synthetic materials or merino wool. Synthetic materials will comfortably wick away sweat, keeping you dry and warm. Merino wool on the other hand will trap the moisture while still feeling warm and comfortable on your skin.

What are base layer tights?

Base later tights are thin, comfortable leggings that are designed to wick away sweat to manage moisture effectively and create a layer of warmth. You can wear them under your trousers or under your shorts when running for example.

Remember, the key factor about base layers is how they regulate your temperature and deal with your sweat. If you simply opt for standard leggings as a base layer for your legs, they won’t do the job as effectively as proper base layers. This can result in you getting colder, meaning the wrong kit can be counterproductive.

Can you wear two base layers?

If the weather is really cold, you can choose to wear two base layers. Opting for two layers will still help you wick away the moisture when you sweat, so you’ll still feel dry and comfortable. Two base layers can also work to trap heat close to your body.

Just remember that base layers are designed to be tight-fitting, so you might find that your movement is restricted slightly if you don a couple of pairs.

How to use base layer clothing?

Base layers should be worn as part of a three-layer system that works to keep you warm and dry when you’re out in the great outdoors.

Your base layer is the first essential layer and works to wick away any moisture from your body – if you don’t have this and you sweat in cold temperatures, your body temperature can drop quickly. The second layer you need is a mid-layer like a fleece that is designed to keep you warm, with the third and final layer being a coat or jacket that protects against the elements. Sticking to the three layer system is the best way to beat the elements in winter – in fact, you’ll stay warmer with three thinner layers than simply opting for one big coat.

Sold on base layers? Any explorer or adventurer worth their salt will tell you the importance of good base layers. So whether you’re skiing, hiking or camping they should always form a key part of your outdoors kit.

What is a base layer | Do I need a base layer | TOG24 (2024)

FAQs

Is a base layer necessary? ›

Base layers are important because they provide an extra layer of insulation while also wicking sweat away from your skin. If you'll be going from hot to cold throughout the day, or doing any activity where you might be sweating in a colder environment, you should definitely opt to wear base layers.

What counts as a base layer? ›

A base layer is a layer of clothing that is closest to your skin, almost acting as 'second skin' that can keep you warm or cool. Base layers and thermal underwear provide a layer of warmth while, at the same time, absorbing and removing your sweat to keep you comfortable while on the move – this is called 'wicking'.

How many base layers do you need? ›

For general backpacking, I always recommend having one set (1 top, 1 bottom) of hiking base layers and one set of sleeping base layers. Base layers generally come in three different materials: Synthetic, Merino Wool, and Silk. Synthetics are great at quickly wicking moisture and drying.

Do you wear something under a base layer? ›

Should you wear anything underneath a base layer? Ideally, any next-to-skin clothing (including bras and underwear) should offer moisture-wicking qualities. As a rule of thumb, we recommend synthetic in the summer and wool in the winter.

Are thermals and base layers the same? ›

Thermals are a type of base layer, but not all base layers are thermals. Both types can provide moisture-wicking, but the key difference between base layers and thermal layers is that thermal fabrics provide more warmth. When people think of layers of clothing, they often think of warming up.

What is the best first layer for cold weather? ›

Cold-weather layers:

Midweight polyester long underwear top and bottom; a jacket with synthetic insulation; midweight fleece pants; waterproof/breathable rain jacket and pants.

Can I use leggings as a base layer? ›

Base layer leggings – The most popular base layers for your bottom half are leggings. These are suitable for both men and women and are available in a variety of thickness grades depending on your activity. These are perfect for both sports and colder climates due to their versatility.

What temperature do you need a base layer at? ›

They are worn to keep your body warm and dry. You need to wear base layers if the temperature is below 10 degrees Celsius to protect your body from the cold. Imagine being in a sub-zero temperature with your regular clothes and jackets to protect you from the external environment.

Should base layers be tight or loose? ›

How should your base layer fit? In order for a base layer to wick properly, the fabric needs to lay against the skin in order to pick up moisture. To enable this, the fit should be relatively snug. An exception to this is if you are wearing the garment with no additional layers in warm weather.

Can you wear a base layer on its own? ›

Can you wear a base layer on its own? Yes! A base layer can be worn either as a single layer or under another garment.

What size base layer should I get? ›

It's generally best to go for your regular size when buying a base layer, as they're deliberately designed to be slightly smaller for a closer fit.

Can you wear 2 base layers together? ›

In addition, if it's very cold, leggings under your trousers will never go amiss. Next comes a fleece (as a mid-layer) and then a windproof/waterproof jacket on top. If you find yourself in cold and blustery weather, we recommend wearing two base layers to really trap your body heat.

Do you wear a bra under the base layer? ›

Should I wear anything under my base layer? “Base layers” are sometimes synonymous with “thermal underwear.” However, if you prefer for hygiene reasons, you can wear boxer shorts or panties underneath. For women, we also recommend a sports bra for optimum support.

Do you wear undies under thermals? ›

First, the underwear will help keep your thermals in place, which will help you stay warm. Second, the underwear will add an extra insulation layer against the cold air. And third, the underwear will help protect your clothing from sweat and body oils, which can damage them over time.

Is a sun hoodie a base layer? ›

Instead of a snug fitting, cold weather base layer, the sun hoody is a loose, long sleeve shirt with sweat wicking, UPF protection, and you guessed it, a hood.

What temperature do you need a base layer? ›

They are worn to keep your body warm and dry. You need to wear base layers if the temperature is below 10 degrees Celsius to protect your body from the cold. Imagine being in a sub-zero temperature with your regular clothes and jackets to protect you from the external environment.

Do you need a base layer in summer? ›

For many people, the idea of putting on more clothing for a warm ride seems counter-intuitive to the point of discomfort. But a summer base layer should be the foundation (the base) of any layering system, regardless of the time of year. A base layer offers next-to-skin comfort that many jerseys cannot provide.

How effective are base layers? ›

Base layers are an essential part of a winter outfit because they act as a second skin ensuring the insulating layer (the mid-layer) and outer shell can function properly. Thermals prevent cold from getting inside and stop body heat from dissipating by protecting you from windchill and keeping your blood flowing.

At what temperature should I wear thermals? ›

Wear thermals under daily clothes

You should check the indoor temperature when you wake up in the morning. If that temperature is lower than 18 degrees C, then, you should wear your thermals under a daily outfit.

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